History & Geology
The Birimian Greenstone Belts of West Africa
July 2013 by Chris Ralph
![](http://www.icmj.com/userfiles/images/201307/TOC-african-nugget.jpg)
Simple Rules of Gold Geology: Comparing Epithermal and Mesothermal Deposits
Geology is a science of general tendencies with frequent exceptions, not one of hard and fast rules that are always true and never vary. For almost every well-accepted rule of gold deposits, I can point you to a number of important exceptions.
Arizona's Vulture Gold Mine and Lost Dutchman
When prospectors and treasure hunters talk of gold in Arizona, it is the Lost Dutchman or Vulture mine they usually think of. The Lost Dutchman gold mine is just that—a myth chalked full of holes that has been embellished over time as any good legend should be.
The Seven Troughs Mining District
![](http://www.icmj.com/userfiles/images/201609/toc-35-seven-troughs.jpg)
It Pays to Know Your Bedrock
On our last trip, we brought ropes and went down the first waterfall forty vertical feet, only to be confronted by a second, sixty-foot-high, overhanging waterfall that emptied into a slot canyon.
Ancient River Channels of Trinity County
Trinity County is located in the far northwest corner of California and stirs up many different memories for those who have been there.
Prospecting for Pegmatites
![](http://www.icmj.com/userfiles/images/201507/52-prospecting-for-pegmatites.jpg)
Ophir—Possibly the Best Kept Secret in Alaska!
![](http://www.icmj.com/userfiles/images/201311/TOC-ophir.jpg)
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